Pith Number

pith:EP2ZXWJ5

pith:2019:EP2ZXWJ5L6UR5WE4BLH2W7OSDX

not attested not anchored not stored refs pending

On the Hardness of Robust Classification

James Worrell, Marta Kwiatkowska, Pascale Gourdeau, Varun Kanade

arxiv:1909.05822 v1 · 2019-09-12 · cs.LG · cs.CC · stat.ML

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EP2ZXWJ5L6UR5WE4BLH2W7OSDX}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-07-05T00:04:18.886227Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

23f59bd93d5fa91ed89c0acfab7dd21df9b3a6c251dda492bf5d99d3516e4d51

Aliases

arxiv: 1909.05822 · arxiv_version: 1909.05822v1 · doi: 10.48550/arxiv.1909.05822 · pith_short_12: EP2ZXWJ5L6UR · pith_short_16: EP2ZXWJ5L6UR5WE4 · pith_short_8: EP2ZXWJ5

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/EP2ZXWJ5L6UR5WE4BLH2W7OSDX \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 23f59bd93d5fa91ed89c0acfab7dd21df9b3a6c251dda492bf5d99d3516e4d51

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "584d42ebd86678a939ea69539d99ac259729fb35056ebb1f15e9f9cf79d3c36f",
    "cross_cats_sorted": [
      "cs.CC",
      "stat.ML"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2019-09-12T17:29:08Z",
    "title_canon_sha256": "60b80d94d5ba40489984650300c35a28b51cca4f38784aba0eb2d7df6587cc00"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1909.05822",
    "kind": "arxiv",
    "version": 1
  }
}